SU1327780A3 - Method of fighting weeds - Google Patents

Abstract

The invention relates to chemical methods for controlling weeds and unwanted vegetation. In order to increase the herbicidal action, phenylacetanilide derivatives of the general formula Y-CjH C(CHj)(C2H5)C(0) (JP) are used as the active substance, where Y is methyl, methyloxy, propyloxy, trifluoromethyl, fluorine; R - C,-C3-apkyl. When using these compounds at doses of 0.3125-5 kg/ha, almost complete destruction of weeds is achieved in the absence of phytotoxicity in relation to cultivated plants, for example, rice. 2 tab. CO s

Description

This invention relates to chemical methods for controlling weeds and unwanted vegetation.

The aim of the invention is to increase the herbicidal effect.

The active substances used in the proposed method are presented in table. one ,

The active substances are used in doses of 0.3125-5 kg / ha. They can be used in the form of conventional formulation forms, for example, wettable powders, granules, emulsifiable concentrates.

Example 1. Special pots were filled with soil from a flooded rice floor and rice plants were planted in the two-leaf stage, weed seeds (chicken millet, umbrella millet, reed millet), and basil tuber. After that, the trees were put into the water with a depth of 3 cm and on the third day after weed germination, the soil was treated with a wetting-25 in order to increase the terbi

damage, the remaining values of the indicators are intermediate.

For comparison, known herbicides were used: 6-methylphenylacetanilide (compound A) and "6, dimethyl-phenylaceto-3-propylanilide (compound B).

The results of the experiments are presented in table. 2 (the numbers of the compounds correspond to the numbers in Table 1).

The results obtained testify to the high efficiency of the proposed method and its advantages over the known analogous methods.

Formula of invention

A method of controlling weeds by treating them or the soil on which they grow is derived from phenyl acetanilide,

with powder active ingredients. Evaluation of the herbicidal effect was evaluated after 3 weeks. after processing on a scale of 0-5 points: 5 - the death of plants is full; 4 - 80-99% lesion; 3–6 0–79% lesion; 2 - 40-52% of the lesion; 1 - 20-39% of the lesion; O - no damage.

Phytotoxicity of rice was evaluated visually by the index: -, +, +, ++, +++, where (-) means the absence of phytotoxicity, and (+++) means

0

five

cidic action as a derivative of phenylacetanilide use a compound of general formula

SgO t.

I o II u1l

AND

Y

WITH-

where Y is methyl, methyloxy, propyloxy,

trifluoromethyl or fluorine; R - C-C-alkyl, in the amount of 0.3125-5 kg / ha.

Table Active compounds of general formula

Y

CH C-CCOINH- Oy

Continuation of table 1

Continuation of table 2

Continued table. 2

1327780

10 Prevailing Table 2

Claims (1)

Claim A method of controlling weeds by treating them or soil in which they grow, derivatives phenylacetanilide, characterized in that, in order to increase the herbicidal effect as derivative phenylacetanilide a compound of general formula with _{Mr 5} where Y - methyl, methyloxy, propyloxy, trifluoromethyl or fluorine; R - C _A -C ₃ -alkyl, in an amount of 0.3125-5 kg / ha. Table 1 Active substances of the General formula Ύ ^ -c-cCowh ^ O; c ₂ H ₅ Compound No. At R 1 2 3 1 2-methyl n-propyl 2 4-Type n-propyl 3 4-Isopropyloxy Ethyl 4 4-Isopropyloxy n-propyl 5 2-methoxy Methyl Continuation of table 1 I 2 3 6 2-methoxy Ethyl 7 2-methoxy n-propyl 8 2-methoxy Isopropyl 9 4-methoxy n-propyl 10 2-propipoxy n-propyp eleven 2-fluorine n-propyl 12 Z-Trifluoromethyl n-propyl table 2 Herbicidal effect and phytotoxicity Compound No. Dose kg / ha Herbicidal effect, score Rice phytotoxicity Chicken millet Umbrella plant Reed millet Swamp 1 5 5 5 5 5 - 2,5 5 5 5 5 - 1.25 5 5 5 5 - 0.625 5 5 5 5 - 0.3125 5 5 5 5 - 2 5 5 5 5 5 2,5 5 5 5 5 - 1.25 5 5 5 5 g 0.625 5 5 4 4 - 0.3125 5 4 4 4 - 3 5 5 5 5 5 - 2,5 5 5 5 5 - 1.25 5 5 5 4 - 0.625 5 5 4 4 - Continuation of Table 2 Compound No. Dose kg / ha Herbicidal effect, score ~) phytocurrent- Chicken millet Umbrella plant Reed millet Swamp regarding rice 0.3125  4 5  4 4 - 4 5 5 5  5 5  - 2,5 5 5 5 5 1.25 5 5 5 5 - 0.625 5 5 4 4 - 0.3125 5 5 4 4 · - 5 5 5 5 5 5 - 2,5 5 5 5 5 - 1.25 5 5 4 4 - 0.625 4 5 4 4 - 0.3125 4 5 4 4 - 6 5 5 5 5 . 5 - 2,5 5 5 5 5 - 1.25 5 5 5 5 - 0.625 5 5 4 5 - 0.3125 5 5 4 4 - 7 5 '5 5 5 5 - 2,5 5 5 5 5 - 1.25 5 5 5 5 - 0.625 5 5 5 5 - 0.3125 5 5 5 5 - 8 5 5 5 5 5 - 2,5 5 5 ' 5 5 - 1.25 5 5 5 5 0.625 4 5 4 4 - 0.3125 4 5 4 4 Continuation of the table. 2 Compound, Dose kg / ha Herbicidal effect point Chicken millet Umbrella plant Reed millet Swamp Phytotoxicity in the otnop of III rice 9 5 . 5 5 5 5 - 2,5 5 5 5 5 - 1.25 4 5 4, 4 - 0.625 4 4 4 4 - 0.3125 4 4 4 4 - 10 5 5 5 5 5 - 2,5 5 5 5 5 - 1.25 5 5 5 5 - 0.625 5 5 5 5 - 0.3125 5 5 4 5 - eleven 5 5 5 5 5 - 2,5 5 5 5 5 - 1.25 5 5 5 5 - 0.625 5 5 5 5 . - 0.3125 5 5 4 5 - 12 5 5 5 5 5 - 2,5 .5 5 5 5 - 1.25 5 5 5 5 - 0.625 5 5 4 5 - 0.3125 5 5 4 4 - A 5 3 3 2 2 - 2,5 2 2 1 1 - 1.25 0 0 0 0 - 0.625 0 0 0 . 0 - 0.3125 0 0 • 0. 0 Continued Table 2 Compound, No. * Dose kg / ha Herbicidal effect point Rice phytotoxicity . - ....... Chicken millet Umbrella plant Reed millet Swamp IN 5 5 5 5 5 2,5 5 5 5 5 - 1.25 5 5 4 5 • - 0.625 5 5 4 4 - 0.3125 5 5 3 4 -